What will the speaker probably talk about next().

A.Cases of physical or sexual abuse.

B.Types of abusive parents.

C.Consequences of child abuse.

D.Laws against child abuse.

将塑料梳子接入闭合电路中，小灯泡不发光，说明塑料梳子是________．用这种梳子梳干燥的头发时，头发会随梳子“飘”起来，这是因为________________________________．